Design of an Automatic Cleaning Energy-Saving Technology for Manganese Sulfate Continuous Production Crystallizer

2013 ◽  
Vol 331 ◽  
pp. 52-56
Author(s):  
Tian Xiang Yu ◽  
Wen Yuan Zhou ◽  
Tian Lan Yu ◽  
De Qi Peng ◽  
Lei Ye
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Flow Velocity ◽  
Continuous Production ◽  
High Energy ◽  
Manganese Sulfate ◽  
Sulfate Production ◽  
Single Effect

To deal with the high energy consumption of the batch-type single-effect evaporator for Manganese sulfate production, a vibrating-spiral fluidized automatic cleaning technology was developed for continuous crystallizer production. The proposed method is presented followed by validation through a heat transfer coefficient comparison experiment. The result has shown that the proposed method has strong capability of automatic cleaning of crystalline scale. When the flow velocity in tubes is 0.80 m/s and the heat transfer temperature difference is 17°C, the overall heat transfer coefficient can reach 90% of that of clean tubes without spiral-fluidization. Furthermore, it is ideal to keep the volumetric concentration of fluidization particles at 1% and the automatic cleaning capability is almost directly proportional to the flow velocity. The automatic-cleaning continuous-production crystallizer technology can effectively replace the atmospheric-pressure single-effect evaporator and reduce the energy consumption by 95%. Comparing to the three-effect evaporator, the proposed method can save energy up to 88%.

Determination of the Effect of Wall Heating Systems on Convective Heat Transfer Coefficient in Buildings

2014 ◽  
Vol 875-877 ◽  
pp. 1630-1636 ◽  
Author(s):  
Ozgen Acikgoz ◽  
Olcay Kincay ◽  
Zafer Utlu
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Thermal Comfort ◽  
Transfer Coefficient ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Convective Heat Transfer Coefficient ◽  
Heated Wall ◽  
Real Size

Decreasing energy consumption and advancing thermal comfort are the most important aims of building engineering. Previously reported studies by many researchers have found that different usages of convective heat transfer coefficient (CHTC) correlations in heating system simulations have considerable impacts on calculated heating load in buildings. Hence, correct utilization of CHTCs in real size room enclosures has great importance for both energy consumption and thermal comfort. In this study, a modeled room was numerically heated from one vertical wall and cooled from the opposite wall in order to create a real room simulation. While cooled wall simulate heat losses of the room, heated wall simulates the heat source of enclosure. Effects of heated and cooled wall temperatures and characteristic length on CHTC and Nusselt number in the enclosure were numerically investigated for two (2-D) and three dimensional (3-D) modeling states. CHTCs and Nusselt numbers of a real size room with the dimensions of 6.00 by 2.85 by 6.00 were found with FLUENT CFD and graphics of change were drawn. As result, difference between 2-D and 3-D solutions was found approximately 10%. This was attributed as the effect of air flow pattern effects over other surfaces in the enclosure that can not be counted at 2-D solutions. The change of CHTC at different characteristic lengths was illustrated as well.

Performance Experimental Study and Energy Consumption Calculation of Hollow Glass Window Film

2011 ◽  
Vol 250-253 ◽  
pp. 356-359
Author(s):  
Dan Ping Yang ◽  
Jia Peng He ◽  
Zheng Song Zhang
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Window Glass ◽  
Hollow Glass ◽  
Window Film ◽  
The Heat Transfer Coefficient ◽  
Energy Consumption Calculation

This paper taked hollow glass window as the model, and heat transfer coefficient, sunshading coefficient and energy consumption of the window glass were obtained in the situations of window glass with and without low-E film by doing experiment and theoretical calculation. The results show that both heat transfer coefficient and sunshading coefficient decrease comparing the hollow glass window film with no film. For the fixed and push-pull window of the whole window, the heat transfer coefficient decrease by 24.2% and 28.9% respectively and sunshade coefficient decreases by 31.37%. And the low-E film by this study adopting reduces energy consumption of the summer greatly by 32.96%, and has no too large effect on winter heating, so the annual energy consumption reduces and the window film saves annual energy consumption 14.62% .

Energy Consumption Analysis of Building with Typical External Thermal Insulation System

2017 ◽  
Vol 898 ◽  
pp. 1970-1977
Author(s):  
Yao Li ◽  
Xian Zheng Gong ◽  
Qing Hua Zhang ◽  
Chong Qi Shi
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Life Cycle ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Thermal Insulation ◽  
Insulation System ◽  
Insulation Thickness ◽  
Building Operation ◽  
Whole Life Cycle

External wall thermal insulation system protects the major structure of building effectively. In this study, a student dormitory building with typical external wall thermal insulation system in Beijing was chosen as the research object and the energy consumption analysis was conducted to identify the optimal external thermal insulation system during the whole life cycle. The results show: for brick-concrete buildings, the consumption of clay brick, reinforced concrete and cement mortar account for more than 95% of the total materials consumption, where reinforced concrete contributes most to energy consumption. The external insulation system with similar heat transfer coefficient but consist of different insulation materials mainly affects energy consumption in materials production phase (the difference of building production energy consumption is about 7.2%), while has no significant effect in building operation phase and whole life cycle. With the increase of heat transfer coefficient, the energy consumption decreases in materials production phase, accounting for 16.3%-21.9% of the life cycle energy consumption, increases in building operation phase, accounting for 78.1%-83.7%, and can be neglected in the disposal phase. And there exists an optimization value in building whole life cycle, at which the minimum value of the energy consumption reaches, when the heat transfer coefficient is 0.3W / (m2 • K), equivalent to 127mm EPS insulation thickness or 151mm rock wool insulation thickness.

scholarly journals Optimization method for prefabricated restroom envelope energy saving characteristics in hot summer and cold winter zone

2021 ◽  
pp. 014459872199393
Author(s):  
Lirui Zhang ◽  
Hong Zhang ◽  
Xu Xu ◽  
Ling Dong
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Thermal Characteristics ◽  
Optimization Method ◽  
Building Energy ◽  
Building Envelope ◽  
Cold Winter ◽  
Energy Consuming

In order to reduce the restroom envelope energy consumption, one optimization method on basis of analyzing the influence of heat transfer coefficient on the performance of a prefabricated restroom envelope in a hot summer and cold winter zone was proposed. An energy-consuming model of prefabricated restroom in Nanjing is initially built based on Designer's Simulation Toolkit software. Subsequently, the effect of external walls, rooftops, external windows with various thermal characteristics on the building envelope is analyzed respectively. Simultaneously, a method that only changes the heat transfer coefficient of the prefabricated restroom envelope while keeping other parameters unchanged is adopted. Results show that, for a prefabricated restroom, the optimal range of heat transfer coefficient of the external wall, rooftop, and external window in hot summer and cold winter zone is 0.199∼0.22, 0.16∼0.19, and 3.0∼3.1 W/(m2·K), respectively. When the window-to-wall ratio is less than 0.2, the priority of the wall heat transfer coefficient on building energy consumption is higher than that of the rooftop heat transfer coefficient, simultaneously, the rooftop heat transfer coefficient has priority higher than window heat transfer coefficient. Thus, it is of great significance to optimize the design of the prefabricated restroom envelope in a hot summer and cold winter zone, which provides relative reference for thermal performance improvement of prefabricated restrooms.

scholarly journals Indoor environmental assessment method in residential kitchen

2020 ◽  
Vol 24 (3 Part B) ◽  
pp. 2055-2065
Author(s):  
Anita Vorosne-Leitner ◽  
Laszlo Kajtar ◽  
Jozsef Nyers
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Residential Buildings ◽  
Local Source ◽  
Radiant Heat Transfer ◽  
Main Role ◽  
Monitoring Method ◽  
Gas Stoves

Nowadays, energy consumption, environmental protection and safety are fundamental issues in design process. In order to reduce energy consumption, buildings become increasingly insulated and air tight. It has controversial effect on indoor environment, therefore, it has become essential to apply an effective ventilation system. This requires detailed design, especially if there is a strong, local source in the space. In residential buildings, gas stoves are significant source of gaseous pollutants and heat load. Indoor environmental assessments have been carried out in order to evaluate the key parameters. The aim of this studies is to develop a new design and monitoring method of residential kitchens with gas stoves. Primary results of laboratory researches indicate that the largest stovetop burner with power of 2.8 kW, has the main role. Significant emissions of NOx have been measured, in an average size kitchen (Vroom = 36 m3) the Hungarian standard NOx concentration level (200 ?g/m3) can be ensured with an exhaust air-flow of 1102 m3/h. With respect of thermal environmental parameters, heat loads of residential gas stoves could be characterized with convective heat transfer coefficient of 4.5 W/m2K and radiant heat transfer coefficient of 5.9 W/m2K. As regards thermal comfort parameters, predicted mean rate index in proved to be applicable in residential kitchens from ?0.3 to +2.0. However draught rating cannot be applied, with respect to the temperature limitations.

scholarly journals The effect of rising damp on heat transfer performance and energy consumption of two kinds of Chinese blue-brick masonry walls

2021 ◽  
Vol 2069 (1) ◽  
pp. 012038
Author(s):  
Z Y Kong ◽  
H R Xie ◽  
Y K Cai ◽  
X Tan ◽  
S Hokoi ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Heat Transfer Performance ◽  
Solid Wall ◽  
Transfer Performance ◽  
Capillary Water ◽  
Transfer Coefficients ◽  
Rising Damp

Abstract Rising damp is common in brick buildings due to groundwater and natural precipitation, which not only causes deterioration of the walls, but also significantly affects the heat transfer coefficient, thermal inertia, and building energy consumption. In order to clarify the effects of rising damp on the heat transfer through traditional Chinese brick solid wall and cavity walls, two types of wall of 1.2 m wide and 3 m high were built in the laboratory. The heat transfer performance under the influence of capillary rising was tested by Simple heating box – heat flow meter method. Based on the data obtained from the experiment, the Energyplus was used to simulate the energy consumption of a Chinese typical residential building influenced by rising damp. The results proposed 3.67 W/m2·K and 3.61 W/m2·K as the recommended heat transfer coefficient for the moisture affected parts in the experimental solid and cavity wall, and the rising capillary water increased the heat transfer coefficients by 74% and 84%, respectively. The heating and cooling load of the solid-wall building under the influence of capillary water increased by 18.5% and 29.6%, respectively, while of cavity-walls building increased by 6.5% and 11.8%.

scholarly journals The Influence of Window-Wall Ratio on Heating Energy Consumption of Rural House in Severe Cold Regions of China

2020 ◽  
Vol 173 ◽  
pp. 03008
Author(s):  
Teng Shao ◽  
Hong Jin ◽  
Wuxing Zheng ◽  
Jin Wang
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Thermal Performance ◽  
Outdoor Environment ◽  
Shape Coefficient ◽  
Heating Energy Consumption ◽  
The Heat Transfer Coefficient ◽  
Large Shape

Rural houses in severe cold areas of China are mostly single-storey independent buildings with large shape coefficient. Compared with urban residential, it has larger contact area between envelope and outdoor environment of each household. Meanwhile, the heat transfer coefficient of window is usually greater than that of external wall and roof. The window-wall ratio is one of the important indicators affecting the energy consumption of rural house. This paper takes window-wall ratio as the main variable, building orientation, thermal performance of envelope and window heat transfer coefficient as the auxiliary variables, and applies DesignBuilder software to quantitatively analyse the mechanism of window-wall ratio on rural house’s heating energy consumption under the interactive influence of multiple factors. Results show that the influence rule of window-wall ratio with different orientations on heating energy consumption will change when the thermal performance of envelope or window heat transfer coefficient changed. The synthetic effect of various factors should be considered in the design to reasonably determine the windowwall ratio of rural house.

scholarly journals Research on Energy-Saving Design of Rural Building Wall in Qinba Mountains Based on Uniform Radiation Field

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Qin Zhao ◽  
Xiaona Fan ◽  
Qing Wang ◽  
Guochen Sang ◽  
Yiyun Zhu
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Energy Saving ◽  
Radiation Field ◽  
Thermal Environment ◽  
Residential Buildings ◽  
South Wall ◽  
Heating Energy Consumption

How to create a healthy and comfortable indoor environment without causing a substantial increase in energy consumption has become a strategic problem that the development of all countries must face and solve. According to the climatic conditions of Qinba Mountains in China, combined with the characteristics of local rural residential buildings and residents’ living habits, the field survey and theoretical analysis were used to study the thermal environment status and the heating energy consumption condition of local rural residential buildings. The thermal design method of walls for the local rural energy-saving buildings based on the indoor uniform radiation field was explored by using the outdoor comprehensive temperature function expressed by the fourth-order harmonic Fourier series as the boundary condition of the wall thermal analysis. ANSYS CFX was adopted to study the suitability of the energy-saving wall structure designed by the above method. The results show that the indoor thermal environment of local rural residential buildings in winter is not ideal and the heating energy consumption is high, but this area has the geographical advantage to develop solar energy buildings. It is proposed that the indoor thermal comfort temperature of local rural residential buildings in winter should not be lower than 14°C. When the internal surface temperature of the external walls in different orientations are equally based on the design principle of uniform radiation field, the heat transfer coefficient of the east wall, the west wall, and the north wall of the local rural residential buildings is 1.13 times, 1.06 times, and 1.14 times of the south wall heat transfer coefficient, respectively. The energy-saving structural wall with KPI porous brick as the main material and the south wall heat transfer coefficient of 0.9 W/(m2·K) is the most suitable energy-saving wall for local rural residential buildings.

Improving the Performance and Energy Efficiency of Pneumatic Dryer for Okara

2017 ◽  
Vol 33 (5) ◽  
pp. 729-736 ◽  
Author(s):  
Chatchai Nimmol ◽  
Anucha Hirunwat
Keyword(s):  
Heat Transfer ◽  
Energy Efficiency ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Specific Energy ◽  
Evaporation Rate ◽  
Specific Energy Consumption ◽  
Water Evaporation ◽  
Drying Process

Abstract. A corrugated-pipe drying column and a multipass drying concept (one-pass and two-pass drying) were proposed in this study to improve the performance and energy efficiency of a conventional pneumatic dryer for okara. The performance (in terms of volumetric water evaporation rate and volumetric heat transfer coefficient) and the energy efficiency of the dryer were evaluated. With the use of the corrugated-pipe drying column, the moisture reduction of the okara, the volumetric water evaporation rate, and the volumetric heat transfer coefficient were enhanced. The specific energy consumption (SEC) of the drying process was also improved. The maximum values of the volumetric water evaporation rate and the volumetric heat transfer coefficient of 765 kgwater m-3 h-1 and 6966 W m-3 K-1, respectively, were found when drying was performed by the system using the corrugated-pipe drying column. The lowest value of the SEC of 3.03 MJ kgwater-1 was also observed. The lowest final moisture content of okara obtained after the two-pass drying was around 0.72 kgwater kgdrysolid-1. Keywords: Corrugated pipe, Multipass drying, Okara, Pneumatic dryer, Specific energy consumption, Volumetric heat transfer coefficient, Volumetric water evaporation rate.

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